I used to code book manuscripts to get them ready to be paged. I worked on a MAC and knew most of the codes as easily as I could type. I used pages & pages of code for college science & math textbooks (one of the reasons those books are so expensive). Now a few years have gone by, I no longer work in the publishing industry because most of those jobs have gone to India, and I use a PC. Thanks for reminding me where they are on this computer.